Simple Oscilloscope

The LCSC training camp oscilloscope has all functions implemented (and the H750 chip is already integrated, eliminating the need for a core board), but it has the following issues
: 1. Error: The peak error is approximately 0.4-0.6V (this could also be due to excessively long traces causing voltage drop).
2. Input channel interference: When one channel receives an input signal, the other channel also receives a small, identical signal, with a peak value approximately 1/100th that of the other channel, and phase lag. This is caused by a PCB design flaw.
3. The 40-pin display in the schematic cannot be driven (the screen has too many pixels, and the chip's memory is insufficient). An external display was designed using the SPI1 pin, so the 40-pin display can be removed from the reference design. 5. It can be connected to a battery, and an additional 8MB of FLASH memory was added, but this was not used at this time due to time constraints; it will be implemented much later.
6. The initial PCB layout had errors. The schematic has been modified, but the PCB layout remains unchanged. Please do not proceed with the initial layout.
7. It supports ISP and SWDIO for program downloading.